Synthesis of ordered mesoporous silicoaluminophosphates by using LTA zeolite precursors dissolved under acidic conditions

Tanaka, Shunsuke; Fukui, Ryosuke; Miyake, Yoshikazu

doi:10.1016/j.matlet.2012.10.108

Cited by 5 publications

(6 citation statements)

References 16 publications

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“…Furthermore, the micropore volume of OMSMS ranges from 0.022 to 0.038 cm 3 /g, whereas the maximum average pore diameter and mesopore volume were 7.8 nm and 0.318 cm 3 /g, respectively. The BET surface area increased from 149 to 171 m 2 /g when the calcination temperature was increased from 500 to 700 °C, which is close to the value obtained for the hierarchical SAPO-11 (149–192 m 2 /g, calcined at 700 °C) described by Wu et al The average pore diameter of 6.4–7.8 nm is also comparable to the pore diameter of 5.4–8.4 nm (calcined at 600 °C) reported by Tanaka et al We observed that, when the calcination temperature was increased to 800 °C, the BET surface area of OMSMS slightly decreased. This may be due to the high calcination temperature causing a slight collapse of the skeleton and agglomeration of the surface grains .…”

Section: Resultssupporting

confidence: 89%

“…As shown in Figure 3a, peaks in the 2θ range of 1.3°−2.0°are present for all analytes, indicating ordered mesoporous structures. 32 OMSMS-600 and OMSMS-700 exhibited two diffraction peaks corresponding to the (100) and (110) planes. 47 Moreover, when the calcination temperature was increased from 500 to 700 °C, the intensity of the diffraction peak of OMSMS increased.…”

Section: Energy and Fuelsmentioning

confidence: 99%

“…Furthermore, the synthesis of an ordered mesoporous aluminosilicate via a template-assisted method using the organic base tetramethylammonium hydroxide was described by Tanaka et al 31 The approach involved using F127 as a template and a zeolite Na-A solution as a single source of silicon and aluminum. The same group 32 also reported dissolving LTA zeolite in an H 3 PO 4 / HCl solution to synthesize ordered mesoporous silicoaluminophosphates by a self-assembly process. The addition of H 3 PO 4 resulted in the incorporation of aluminum into the product skeleton.…”

Section: Introductionmentioning

confidence: 99%

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Decarboxylation of Oleic Acid over Ordered Mesoporous Pt/SAPO-11

Liu

2019

Energy Fuels

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Ordered mesoporous SAPO-11 molecular sieves (OMSMS) with a single mesoporous structure were prepared via a one-step hydrothermal method. Metal–acid bifunctional Pt/SAPO-11 (Pt/OMSMS-700) catalysts with Pt loadings of 1% and 2% were synthesized by a deposition–precipitation method using OMSMS-700 as a carrier. The OMSMS and Pt/OMSMS-700 were characterized using transmission electron microscopy (TEM), scanning electron microscopy (SEM), Brunauer–Emmett–Teller (N2 -BET) analysis, and X-ray powder diffraction (XRD). TEM and small-angle XRD results revealed that the degree of order in the OMSMS increased as the calcination temperature increased from 500 to 700 °C. The N2 -BET analysis revealed that the OMSMS had a mesoporous structure with an average pore diameter of 6.4–7.8 nm and a BET surface area of 149–171 m2/g. The sizes of the Pt nanoparticles supported on OMSMS-700 were in the range of 3 to 6 nm and displayed good dispersibility. The catalytic performance of Pt/OMSMS-700 during the decarboxylation of oleic acid to form C8–C17 alkanes under a CO2 atmosphere was investigated. As the reaction temperature increased from 320 to 360 °C, the total yield of C8–C17 alkanes initially increased and then decreased. Increasing the Pt loading led to an increased yield of C8–C17 alkanes. The total yield of C8–C17 alkanes reached 78% when 2 wt % Pt/OMSMS-700 was used at 340 °C for 3 h.

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Section: Resultssupporting

confidence: 89%

Section: Energy and Fuelsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Decarboxylation of Oleic Acid over Ordered Mesoporous Pt/SAPO-11

Liu

2019

Energy Fuels

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“…So far, many effective methods [37] have been used to introduce meso/macropores into the SAPO-34 molecular sieves, such as post-treatment method (etching by acid to remove Al atoms [38] and alkali to remove Si atoms [39]), confined space synthesis method [40,41], hard template method [42] and soft template method [8,43]. Soft templates that can give rise to mesostructure mainly include poly-quaternary ammonium organic surfactant, amphiphilic organosilane surfactant [3], cationic water soluble polymers such as polydiallyl-dimethylammonium chloride (PDADMAC) and PDDAM [44,45], nonionic water soluble polymers such as P123 [46], PEI [47]. Among these methods, the polymers have been paid much attention due to their good thermal stability and strong interaction of the templates with silica species, adjustable composition and low cost [48].…”

Section: Introductionmentioning

confidence: 99%

Performance Enhanced SAPO-34 Catalyst for Methanol to Olefins: Template Synthesis Using a CO2-Based Polyurea

Qin

Xiao

et al. 2018

Catalysts

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Introducing mesopores into the channels and cages of conventional micropores CHA (Chabazite) topological structure SAPO-34 molecular sieves can effectively improve mass transport, retard coke deposition rate and enhance the catalytic performance for methanol to olefins (MTO) reaction, especially lifetime and olefins selectivity. In order to overcome the intrinsic diffusion limitation, a novel CO2-based polyurea copolymer with affluent amine group, ether segment and carbonyl group has been firstly applied to the synthesis of SAPO-34 zeolite under hydrothermal conditions. The as-synthesized micro-mesoporosity SAPO-34 molecular sieve catalysts show heterogeneous size distribution mesopores and exhibit slightly decrease of BET surface area due to the formation of defects and voids. Meanwhile, the catalysts exhibit superior catalytic performance in the MTO reaction with more than twice prolonged catalytic lifespan and improvement of selectivity for light olefins compared with conventional microporous SAPO-34. The methodology provides a new way to synthesize and control the structure of SAPO-34 catalysts.

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“…15,16 Miyake et al reported that ordered mesoporous silicoaluminophosphates were synthesized using PEO 106 PPO 70 PEO 106 triblock copolymer. 17 Compared with the block polymers, polyethyleneimine (PEI) is a dendrimer with a repeating unit composed of an amine group and two-carbon chain, and that is inexpensive and readily available in several molecular weights, 18 which differs far from currently used meso-templates. Previous work 19,20 revealed that PEI molecules are highly coiled at basic conditions (pH > 9), and while at acidic conditions (pH < 7) are elongated.…”

mentioning

confidence: 99%